.body_box {
  font-family: "微软雅黑";
  width: 100%;
  margin: 0;
  width: 100%;
  height: 100vh;
  color: #fff;
  background: linear-gradient(-45deg, #231f6e, #20bdfe, #2600b4, #1d1a44);
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
  overflow: hidden;
  display: flex;
  align-items: center;
}
@keyframes gradientBG {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}
a:hover {
  text-decoration: underline
}
.loginBox {
  width: 520px;
  height: 500px;
  background: url(../images/bg.png) no-repeat;
  background-size: 100% 100%;
  margin: 0 auto;
  overflow: hidden
}
.loginBox h1 {
  color: #fff;
  text-align: center;
  font-weight: bold;
  font-size: 26px;
  margin-top: 90px;
  letter-spacing: 7px;
  margin-bottom: 20px
}
.loginBox .item {
  width: 300px;
  height: 45px;
  margin-left: 105px;
  border: 1px solid #1d90c5;
  margin-bottom: 10px;
  background: rgba(11,116,180,0.8);
  display: flex
}
.loginBox .item .icon {
  float: left;
  width: 45px;
}
.loginBox .item .icon img {
  display: block;
  width: 20px;
  margin: 12px;
}
.loginBox .item .txt {
  flex: 1;
}
.loginBox .item .txt input {
  border: 0;
  background: none;
  outline: none;
  width: 100%;
  height: 45px;
  line-height: 45px;
  color: #fff;
  letter-spacing: 1px;
  font-size: 14px
}
.loginBox .item .yzm {
  float: right;
  width: 100px;
  overflow: hidden;
  padding-left: 10px
}
.loginBox .item .yzm img {
  display: block;
  width: 100px;
  height: 45px;
}
:-moz-placeholder { /* Mozilla Firefox 4 to 18 */
  color: #fff;
  opacity:1;
}

::-moz-placeholder { /* Mozilla Firefox 19+ */
  color: #fff;
  opacity:1;
}
input:-ms-input-placeholder {
  color: #fff;
  opacity:1;
}
input::-webkit-input-placeholder {
  color: #fff;
  opacity:1;
}
.loginBox .item_2 {
  width: 300px;
  margin-left: 105px;
  overflow: hidden;
  padding-bottom: 20px
}
.loginBox .item_2 a {
  float: right;
  color: #fff;
  font-size: 12px
}
.loginBox .item_2 input {
  float: left;
}
.loginBox .item_2 span {
  float: left;
  color: #fff;
  font-size: 12px
}
.loginBox .item_3 {
  width: 300px;
  margin-left: 105px;
  overflow: hidden
}
.loginBox .item_3 .btn {
  width: 300px;
  height: 45px;
  background: #3FB5E3;
  border: 0;
  outline: none;
  text-align: center;
  line-height: 45px;
  color: #fff;
  letter-spacing: 2px;
  font-size: 16px;
  font-weight: bold;
  border: 1px solid #1d90c5;
  margin-bottom: 10px;
  cursor: pointer
}
input[type=checkbox] {
  margin-right: 5px;
  cursor: pointer;
  font-size: 14px;
  width: 11px;
  height: 10px;
  position: relative;
}
input[type=checkbox]:after {
  position: absolute;
  width: 6px;
  height: 13px;
  top: 0;
  content: " ";
  background: rgba(11,116,180,1);
  border: 1px solid #1d90c5;
  color: #fff;
  display: inline-block;
  visibility: visible;
  padding: 0px 3px;
  border-radius: 3px;
}
input[type=checkbox]:checked:after {
  content: "✓";
  font-size: 12px;
}
.loginBox .item_4 {
  width: 300px;
  margin-left: 105px;
  overflow: hidden;
  margin-top: 10px;
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.5px
}
.loginBox .item_4 a {
  color: #1d90c5;
  font-size: 12px;
  font-weight: bold;
  padding-left: 3px
}
.loginBox .item_5 {
  width: 300px;
  margin-left: 105px;
  overflow: hidden;
  margin-top: 80px;
  letter-spacing: 0.5px;
  margin-bottom: 70px
}
.loginBox .item_5 p {
  text-align: center;
  color: #fff;
  font-size: 14px;
}
